ADIS16488CMLZ datasheet(22/35 Pages) AD

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ADIS16488A

Data Sheet

Rev. C | Page 22 of 35

FIR FILTER BANKS

The ADIS16488A provides four configurable, 120-tap FIR filter

banks. Each coefficient is 16 bits wide and occupies its own

these banks, usea sample rateof2.46 kHzandscalethecoefficients

so that their sum equals 32,768. For filter designs that haveless

than 120 taps, load the coefficients into the lower portion of the

filter and start with Coefficient 1. To prevent adding phasedelay

to the response, ensurethat all unused tapsare equal to zero.

The FILTR_BNK_x registers providethreebits per sensor,

which configure the filter bank(A, B, C, D) and turn filtering

on and off. For example, turn to Page 3 (DIN = 0x8003), then

write 0x0057 to FILTR_BNK_0 (DIN = 0x9657, DIN = 0x9700)

to set the x-axis gyroscope to use the FIR filter in BankD, to set

the y-axis gyroscope to use the FIR filter in BankB, and to

enable these FIR filters in both x- and y-axis gyroscopes. Note

that the filter settings update after writing to the upperbyte;

therefore, always configurethe lower bytefirst. In cases that

require configuration to only the lower byte of either

FILTR_BNK_0 or FILTR_BNK_1, completethe process by

writing 0x00 to the upper byte.

Table 58. FILTR_BNK_0(Page3, Base Address = 0x16)

Bits

Description (Default = 0x0000)

Don’t care

Y-axis accelerometer filter enable (1 = enabled)

[13:12]

Y-axis accelerometer filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

X-axis accelerometer filter enable (1 = enabled)

[10:9]

X-axis accelerometer filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

Z-axis gyroscope filter enable (1 = enabled)

[7:6]

Z-axis gyroscope filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

Y-axis gyroscope filter enable (1 = enabled)

[4:3]

Y-axis gyroscope filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

X-axis gyroscope filter enable (1 = enabled)

[1:0]

X-axis gyroscope filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

Table 59. FILTR_BNK_1(Page3, Base Address = 0x18)

Bits

Description (Default = 0x0000)

[15:12]

Don’t care

Z-axis magnetometer filterenable (1 = enabled)

[10:9]

Z-axis magnetometer filterbank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

Y-axis magnetometer filter enable (1 = enabled)

[7:6]

Y-axis magnetometer filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

X-axis magnetometer filter enable (1 = enabled)

[4:3]

X-axis magnetometer filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

Z-axis accelerometer filter enable (1 = enabled)

[1:0]

Z-axis accelerometer filter bank selection:

00 = Bank A, 01 = Bank B, 10 = Bank C, 11 = Bank D

Filter Memory Organization

Each filter bankuses two pages of the user register structure.

See Table 60, Table 61, Table 62, and Table 63 for the register

addressesin each filter bank.

Table 60. Filter Bank A Memory Map

Page

PAGE_ID

Address

0x05

0x00

PAGE_ID

0x05

0x02 to 0x07

Not used

0x05

0x08

FIR_COEF_A000

0x05

0x0A

FIR_COEF_A001

0x05

0x0C to 0x7C

FIR_COEF_A002 to

FIR_COEF_A058

0x05

0x7E

FIR_COEF_A059

0x06

0x00

PAGE_ID

0x06

0x02 to 0x07

Not used

0x06

0x08

FIR_COEF_A060

0x06

0x0A

FIR_COEF_A061

0x06

0x0C to 0x7C

FIR_COEF_A062 to

FIR_COEF_A118

0x06

0x7E

FIR_COEF_D119

Table 61. Filter Bank B Memory Map

Page

PAGE_ID

Address

0x07

0x00

PAGE_ID

0x07

0x02 to 0x07

Not used

0x07

0x08

FIR_COEF_B000

0x07

0x0A

FIR_COEF_B001

0x07

0x0C to 0x7C

FIR_COEF_B002 to

FIR_COEF_B058

0x07

0x7E

FIR_COEF_B059

0x08

0x00

PAGE_ID

0x08

0x02 to 0x07

Not used

0x08

FIR_COEF_B060

0x08

0x0A

FIR_COEF_B061

0x08

0x0C to 0x7C

FIR_COEF_B062 to

FIR_COEF_B118

0x08

0x7E

FIR_COEF_B119

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